From: Gerhard Hickl <gerhard.hickl@aon.at>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Cc: Paul <paul@abelian.netcom.co.uk>
In-Reply-To: <4D7BABEC.7010602@abelian.netcom.co.uk>
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	 <1299942133.2308.2.camel@gerhard-desktop>
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Date: Sat, 12 Mar 2011 18:45:05 +0100
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Subject: LF: Re: 8969.98
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Hello group!

Below, you'll find a copy of the E-mail conversation between Paul and me
regarding my TX experiments today.





Hello Paul!

Nice to hear back from you and thank you very much for observing and the
detailed analysis you provided.

I switched to DHO38 synchronisation at about 15:00z and it worked for a
while. Then I left for about a hour and when i got back, I saw that the
level of DHO38 dropped so deep that synchronisation of SpecLab wasn't
possible any more. This is a possible explanation for the "insufficient
signal" between 15 and 16z. 


I'm using an indoor ferrite antenna to derive the DHO-signal and
additionally it's not far away from the loading coil. So basically, this
method would work but it's necessary to bring the receiving antenna
outside and as far as possible away from the coil.

Together with your reported sun-activity between 15:23 to 15:56, the
loss of synchronisation makes sense to me. Meanwhile I switched back to
GPS.

I will let you know when I switch off.

73 es tnx
OE3GHB
Gerhard




 


Am Samstag, den 12.03.2011, 17:22 +0000 schrieb Paul:
> Gerhard,
> 
> Here are some hourly measurements
> (UT, amplitudes +-50%, absolute phase mod 360 (+/- 5 deg))
> 
>   09:00-10:00  0.13fT   28 deg
>   10:00-11:00  0.07fT  -31 deg
>   11:00-12:00  0.12fT -156 deg
>   12:00-13:00  0.10fT -180 deg
>   13:00-14:00  0.21fT  170 deg
>   14:00-15:00  0.17fT  162 deg
>   15:00-16:00  insufficient signal
>   16:00-17:00  0.13fT Frequency now 8969.980278
> 
> Average frequency 09:00 - 15:00 = 8969.98Hz + 29.1uHz +/- 0.8 uHz
> 
> Strong solar flares affect VLF propagation from
>   12:56 to 13:22,
>   15:23 to 15:56;
> 
> Absolute phase defined by
> 
>    signal = cos( 2*pi*F*T + phase)
> 
> where T = seconds since 1970-01-01_00:00:00.00000000;
>        F = 8969.98000000;
> 
> Will continue to monitor signal.  Let me know when you switch off.
> 
> --
> Paul Nicholson
> --